Python執行while循環 (Python do while loop)

Like other programming languages, do while loop is an exit controlled loop – which validates the test condition after executing the loop statements (loop body).

像其他編程語言一樣， do while循環是退出控制的循環-在執行循環語句(循環主體)后驗證測試條件。

In Python programming language, there is no such loop i.e. python does not have a do while loop that can validate the test condition after executing the loop statement. But, we can implement a similar approach like a do while loop using while loop by checking using True instead of a test condition and test condition can be placed in the loop statement, and break the loop's execution using break statement – if the test condition is not true.

在Python編程語言中，沒有這樣的循環，即python沒有do while循環可以在執行loop語句后驗證測試條件。 但是，我們可以通過使用True而不是測試條件進行檢查，從而實現類似while循環的do while循環方法，方法是使用True而不是測試條件進行檢查，并且可以在循環語句中放置測試條件，并使用break語句中斷循環的執行-如果測試條件為不對。

Logic to implement an approach like a do while loop

實現類似do while循環的方法的邏輯

• Use while loop with True as test condition (i.e. an infinite loop)

  在測試條件為True的情況下使用while循環 (即無限循環)

• Write statements of loop body within the scope of while loop

  在while循環范圍內編寫循環主體的語句

• Place the condition to be validated (test condition) in the loop body

  將要驗證的條件(測試條件)放在循環體內

• break the loop statement – if test condition is false

  中斷循環語句 –如果測試條件為假

使用while循環實現do while循環的Python代碼 (Python code to implement a do while loop using while loop)

Example 1: Print the numbers from 1 to 10

示例1：打印從1到10的數字

# print numbers from 1 to 10 count = 1while True:print(count)count += 1# test conditionif count>10:break

Output

輸出量

1 2 3 4 5 6 7 8 9 10

Example 2: Input a number and print its table and ask for user's choice to continue/exit

示例2：輸入數字并打印其表格，然后要求用戶選擇繼續/退出

# python example of to print tables count = 1 num = 0 choice = 0while True:# input the number num = int(input("Enter a number: "))# break if num is 0if num==0:break # terminates inner loop# print the table count = 1while count<=10:print(num*count)count += 1# input choicechoice = int(input("press 1 to continue..."))if choice != 1:break # terminates outer loopprint("bye bye!!!")

Output

輸出量

Enter a number: 3 3 6 9 12 15 18 21 24 27 30 press 1 to continue...1 Enter a number: 19 19 38 57 76 95 114 133 152 171 190 press 1 to continue...0 bye bye!!!

翻譯自: https://www.includehelp.com/python/do-while-loop.aspx

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